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Have a second ThinkPad battery charged and ready to go whenever you need it. The ThinkPad External Battery Charger gives you maximum power flexibility by charging a spare battery independent of your ThinkPad system. This external unit operates independent of your ThinkPad notebook so you can charge a spare battery at any time. It must be used with the ThinkPad and Lenovo 90W AC Adapter or 65W AC Adapter, which ship with Lenovo ThinkPads and can be purchased separately. The external unit frees up your ThinkPad notebook so you can continue to work off the system battery while charging a spare battery to increase your unplugged mobile computing time.